The frequency of sexually transmitted diseases (e.g. Chlamydia), abortions and childbirths by young people is higher in Iceland than in the other Nordic countries. This causes concern and the need to resist this development. Mothers are commonly thought to be one of the most important providers of sex education to their children. The aim of my study is to explore the mothers’ point of view regarding the sex education they provide for their children. A qualitative approach was used in seven open interviews with mothers of 15 and 16 year old children in the Reykjavik area. The results showed that all the mothers considered their roles of sex education serious and important. They were concerned about their children’s sexual welfare and educated them about the physical aspects, ethical considerations and risk factors associated with sexual behavior. They emphasized the risk factors in their teachings and were most intimidated by the increase of pornographic material containing misleading guidance. The mothers seemed to be at more ease giving sex education to their daughters than their sons, and were more concerned about the effects of pornography on their daughters than their sons. The mothers’ plethora of sex teaching techniques was categorized by value and purpose. Their methods were compiled into the following groups: Communicative behavior; Behavioral restraints; Education materials as an aid; Quality time; Valuable experience and expertise knowledge; Parental relationship; and Enhancement of family relations. The mothers’ repertoire of teaching methods increased if they considered their child to be or becoming sexually active. All mothers were certain that their children appreciated the education, but some were concerned if it was adequate. The mothers appeared isolated in their teachings at home, they received varying amount of help from the fathers, but all had ample expectations to the sex education provided by the school. It is hoped that the results may be of aid to campaigns of safer sex and other programs of preventive measures aimed towards young people. The study suggests a number of further investigative inquiries.